Age matters. We measure people against their years. God doesn't. He says little children aren't too young to work for Him, and that the elderly is not too old because maybe they have retired. In fact, the New Testament doesn't really refer to age. We are permanently in service to God. Our value and purpose don't decease as we grow older. We are precious in the sight of God, no matter our age. We are useful in the kingdom's work until He returns or calls us home.
"Gray hair is a crown of glory; it is gained by living a godly life." - Proverbs 16:31(NLT)
"So teach us to number our days that we may get a heart of wisdom." -Psalm 90:12(ESV)